SAT (better for math people) = in-depth, less questions, harder math
ACT (Better for fast readers) = way more reading, more shallow, easier math, more questions
You can also bring a hand watch with you to manage time, and that’s really important because for some sections you have around a minute per question, if I recall correctly.
I used the relatively same amount of studying for the test, but for me personally, the ACT style of questions were easier. The questions are not as in-depth as the SAT, there are more of them, and you have less time. I like this style because I’m not as strong in math, and I made up for a 26 math score with a 35/34 reading/writing score. 1270 SAT, 31 ACT